Which of the following is a disadvantage of using solar energy?
A. Solar and angels are expensive
B. Solar energy is available only during summer
C. Solar panels do not work very well
D. Solar energy produces greenhouse gases

The structure of a dna molecule is best described as a. one long strand of nucleic acids b. two strands of dna nucleotides joined by hydrogen bonds c. two strands of amino acids joined by hydrogen bonds d. one long strand of amino acids